Rapid ignition of fluidized bed boiler

Details Rapid ignition of fluidized bed boiler Rapid ignition of fluidized bed boiler

1976-03-15

1976-12-14

Sprague, Kenneth W.

Furnaces

With fuel treatment means

Preliminary refuse treatment means

122 4D, F23D 1900

Patent

active

039968634

ABSTRACT:
A fluidized bed boiler is started up by directing into the static bed of inert and carbonaceous granules a downwardly angled burner so that the hot gases cause spouting. Air is introduced into the bed at a rate insufficient to fluidize the entire bed. Three regions are now formed in the bed, a region of lowest gas resistance, a fluidized region and a static region with a mobile region at the interface of the fluidized and static regions. Particles are transferred by the spouting action to form a conical heap with the carbonaceous granules concentrated at the top. The hot burner gases ignite the carbonaceous matter on the top of the bed which becomes distributed in the bed by the spouting action and bed movement. Thereafter the rate of air introduction is increased to fluidize the entire bed, the spouter/burner is shut off, and the entire fluidized bed is ignited.

REFERENCES:
patent: 2976853 (1961-03-01), Hunter et al.
patent: 3565022 (1971-02-01), Bishop
patent: 3881857 (1975-05-01), Hoy et al.

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